CN210608710U - Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle - Google Patents
Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle Download PDFInfo
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Abstract
The utility model discloses a multi-frequency multi-load wireless power supply system based on PT symmetry principle, which comprises n emitting devices, n receiving devices and n loads, wherein n is a natural number more than or equal to 2; each transmitting device consists of a negative resistor, a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series, the negative resistor provides energy for the system, and the transmitting coils of the n transmitting devices are mutually decoupled or in a weak coupling state; each receiving device consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series, one load is connected with one receiving device in series, and the receiving coils of the n receiving devices are mutually decoupled or in a weak coupling state. The utility model discloses utilize PT symmetry principle to realize the distribution and the control of power between the many loads to adopt the multifrequency transmission, solve the influence of cross coupling between the coil to the system, realize can stably providing constant power for a plurality of loads high-efficiently simultaneously, in practical application, have and show the advantage.
Description
Technical Field
The utility model relates to a wireless power transmission or wireless power transmission's technical field especially indicates a multifrequency many loads wireless power supply system based on PT symmetrical principle.
Background
In the prior art, Wireless Power Transfer (WPT) technology has the advantages of flexibility, convenience, safety, reliability, etc. compared with the traditional wire Power supply mode without electrical connection. The existing wireless power transmission technology is mainly based on the electromagnetic induction and magnetic resonance principle, and part of research results are applied to the fields of electronic consumer products, implantable medical equipment, electric vehicle charging and the like. With the development of wireless power transmission technology, the demand for a multi-load wireless power supply system is increasing, but power distribution and control among loads and cross coupling between a transmitting coil and a receiving coil are always major bottleneck problems restricting the development of the multi-load wireless power supply system.
In recent years, researchers apply the space-time (PT) symmetric quantum theory to the field of wireless power transmission, which shows great advantages, realizes constant output power and transmission efficiency, and is expected to solve the power distribution and control problems in a multi-load system, but the conventional PT symmetric principle-based wireless power supply system is very sensitive to cross coupling between coils.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's shortcoming and not enough, provide a multifrequency many loads wireless power supply system based on PT symmetrical principle, utilize PT symmetrical principle to realize the distribution and the control of power between the many loads to adopt the multifrequency to transmit and solve between the coil cross coupling to the influence of system, realize simultaneously can stably providing constant power for a plurality of loads high-efficiently, in practical application, have and show the advantage.
In order to achieve the above object, the present invention provides a technical solution: a multi-frequency multi-load wireless power supply system based on PT symmetry principle comprises n transmitting devices, n receiving devices and n loads, wherein n is a natural number greater than or equal to 2; each transmitting device consists of a negative resistor, a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series, wherein the negative resistor provides energy for the system, and the transmitting coils of the n transmitting devices are mutually decoupled or in a weak coupling state; each receiving device consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series, one load is connected with one receiving device in series, and the receiving coils of the n receiving devices are mutually decoupled or in a weak coupling state.
Further, the natural frequencies of the n transmitting devices are different from each other, while the natural frequency of the i-th transmitting device is the same as the natural frequency of the i-th receiving device, i is 1,2,3 … n, that is, the following conditions are satisfied:
ωt1＝ωr1≠ωt2＝ωr2≠…ωtn＝ωrn
wherein the natural frequency of the i-th transmitting device is represented by
The natural frequency of the i-th receiving device is shown as
LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriThe i-th receiving end resonance capacitance value is 1,2,3 … n.
Further, when the system operates stably, the space-time symmetry condition needs to be satisfied:
in the formula, Rti、RriThe equivalent internal resistance values of the ith transmitting coil and the ith receiving coil are respectively; -RNiIs the value of the ith negative resistance; -RLiIs the value of the ith load;
for the coupling coefficient between the i-th transmitting coil and the i-th receiving coil, MtiriIs the mutual inductance value between the ith transmitting coil and the ith receiving coil, LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the i-th receiving coil.
Further, the voltage and current relationship of the negative resistance satisfies the following conditions: vti＝-RNiItiThe phase relation satisfies:
wherein, ItiIs the current flowing through the ith negative resistance, VtiIs the voltage across the ith negative resistor, -RNiThe resistance value of the ith negative resistance is automatically adjustable.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
1. the constant power is stably and efficiently provided for a plurality of loads at the same time, and the problems of power distribution and control among the loads are solved.
2. The adverse effect of cross coupling between the coils on the system is solved.
Drawings
Fig. 1 is a schematic diagram of an equivalent circuit of a multi-frequency multi-load wireless power supply system based on PT symmetry principle.
Fig. 2 is a schematic diagram of two completely decoupled transmit coils in an embodiment.
Fig. 3 is a graph of the transmission efficiency of the system versus the coupling coefficient in the embodiment.
Fig. 4 is a graph of the obtained power versus the coupling coefficient for each load in an embodiment.
Detailed Description
To further illustrate the aspects and features of the present invention, the following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the invention is not limited thereto.
As shown in fig. 1, the multi-frequency multi-load wireless power supply system based on PT symmetry principle provided in this embodiment includes n transmitting devices, n receiving devices, and n loads RLiN is a natural number greater than or equal to 2;each of the transmitting devices is composed of series-connected negative resistors-RNiTransmitting coil LtiA transmitting end resonant capacitor CtiAnd equivalent internal resistance R of transmitting coiltiComposition i ═ 1,2,3 … n, where negative resistance-RNiProviding energy for the system, wherein the transmitting coils of the n transmitting devices are mutually decoupled or in a weak coupling state; each receiving means is formed by a receiving coil L connected in seriesriReceiving end resonant capacitor CriAnd equivalent internal resistance R of receiving coilriIs composed of, and a load RLiThe receiving coils of the n receiving devices are mutually decoupled or in a weak coupling state.
The natural frequencies of the n transmitting devices are set to be different from each other, and the natural frequency of the i-th transmitting device is set to be the same as the natural frequency of the i-th receiving device. At this time, the coupling between the ith transmit coil and the jth receive coil has a negligible effect on the system, where i ≠ 1,2,3 … n, j ═ 1,2,3 … n, and i ≠ j. Therefore, the ith transmitting device and the ith receiving device can stably work independently of other coils, and the system is analyzed by taking the ith transmitting device and the ith receiving device as an example, and then according to fig. 1, the system can be obtained by kirchhoff's law:
in the formula (1), -RNiIs the ith negative resistance value, RLiIs the ith load resistance value; omega is the working frequency of the system,
indicates the natural frequency of the i-th transmitting device,
denotes the natural frequency, L, of the i-th receiving devicetiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriIs the ith receiving end resonance capacitance value, Rti、RriRespectively the equivalent internal resistance values of the ith transmitting coil and the ith receiving coil,
the current vectors of the ith transmitting device and the receiving device respectively,
for the coupling coefficient between the i-th transmitting coil and the i-th receiving coil, MtiriIs the mutual inductance value between the ith transmitting coil and the ith receiving coil.
The condition for non-zero solution of formula (1) is:
the real-imaginary part separation of equation (2) can be obtained:
when the i-th transmitting device and the i-th receiving device form an astronomical-time symmetric circuit, i.e.
Equation (3) can be simplified as:
from the above equation, the frequency solution can be:
the condition that a purely real solution of frequency exists can be further derived from equation (6):
therefore, the following conditions are also required to be met during the steady-state operation of the system:
at this time, from the equations (1) and (4), the ith transmitter current effective value I can be obtainedtiWith the current effective value I of the ith receiving deviceriThe ratio of the components is as follows:
at this time, the transmission efficiency η between the ith transmitting device and the ith receiving devicetiriEqual to:
power P of ith loadoiEqual to:
in the formula Vti，VriRespectively the ith negative resistance and the voltage across the ith load.
For further explanation, in this embodiment, the utility model discloses an advantage, has designed a dual-frenquency dual-load wireless power transmission system based on PT symmetry principle. The electrical parameters of the system are as follows: first transmitting coil inductance L t1200 muh, second transmitter coil inductance L t2200 muh, first receiver coil inductance L r1200 muh, second receiver coil inductance L r2200 muH, natural frequency ωt1＝ωr1＝300kHz,ωt2＝ωr2Equivalent internal resistance R at 200kHzt1＝Rt2＝Rr1＝Rr2Neglecting the coupling between the transmitting coils and between the receiving coils, the negative resistance is realized by the power electronic circuit, 0.1 Ω.
Optionally, fig. 2 is a structure of two mutually decoupled transmitting coils, which is implemented by stacking DD-type coils and rectangular coils of the same size, so as to implement decoupling between the coils and save an installation space, but the transmitting coils are not limited to the above structure.
FIG. 3 and FIG. 4 show a load RL1＝10Ω,RL2When being 5 omega, the system transmission efficiency that the emulation obtained and the output power and the coupling coefficient's that each load obtained relation curve, can see from the figure that the utility model provides a system is in the space symmetry-time symmetry region, and each load output power and transmission efficiency do not receive the influence of cross coupling between transmitting coil and the receiving coil, can realize simultaneously stably providing invariable power for a plurality of loads high-efficiently.
The embodiment just does the utility model discloses a preferred embodiment, the utility model provides a multifrequency many loads wireless power supply system based on PT principle of symmetry, the utility model discloses and its embodiment should not be limited to this only, so all according to the utility model discloses a change that shape, principle were done all should cover the utility model discloses an in the protection scope.
Claims (4)
1. The utility model provides a multifrequency many loads wireless power supply system based on PT symmetrical principle which characterized in that: the system comprises n transmitting devices, n receiving devices and n loads, wherein n is a natural number greater than or equal to 2; each transmitting device consists of a negative resistor, a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series, wherein the negative resistor provides energy for the system, and the transmitting coils of the n transmitting devices are mutually decoupled or in a weak coupling state; each receiving device consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series, one load is connected with one receiving device in series, and the receiving coils of the n receiving devices are mutually decoupled or in a weak coupling state.
2. The system according to claim 1, wherein the system comprises: the natural frequencies of the n transmitting devices are different from each other, while the natural frequency of the ith transmitting device is the same as the natural frequency of the ith receiving device, i is 1,2,3 … n, that is to say, the natural frequencies satisfy:
ωt1＝ωr1≠ωt2＝ωr2≠…ωtn＝ωrn
wherein the natural frequency of the i-th transmitting device is represented by
The natural frequency of the i-th receiving device is shown as
LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriThe i-th receiving end resonance capacitance value is 1,2,3 … n.
3. The system according to claim 1, wherein the system comprises: when the system operates stably, the space-time symmetry condition needs to be met:
in the formula, Rti、RriThe equivalent internal resistance values of the ith transmitting coil and the ith receiving coil are respectively; -RNiIs the value of the ith negative resistance; -RLiIs the value of the ith load;
for the coupling coefficient between the i-th transmitting coil and the i-th receiving coil, MtiriIs the mutual inductance value between the ith transmitting coil and the ith receiving coil, LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the i-th receiving coil.
4. The system according to claim 1, wherein the system comprises: the voltage and current relation of the negative resistance satisfies the following conditions: vti＝-RNiItiThe phase relation satisfies:
wherein, ItiIs the current flowing through the ith negative resistance, VtiIs the voltage across the ith negative resistor, -RNiThe resistance value of the ith negative resistance is automatically adjustable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611375A (en) * | 2019-10-28 | 2019-12-24 | 华南理工大学 | Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN112531922A (en) * | 2020-11-20 | 2021-03-19 | 南京理工大学 | Information feedback system based on space scale-time symmetric circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611375A (en) * | 2019-10-28 | 2019-12-24 | 华南理工大学 | Multi-frequency multi-load wireless power supply system based on PT (potential Transformer) symmetry principle |
| CN112531922A (en) * | 2020-11-20 | 2021-03-19 | 南京理工大学 | Information feedback system based on space scale-time symmetric circuit |
| CN112531922B (en) * | 2020-11-20 | 2022-09-20 | 南京理工大学 | Information feedback system based on space scale-time symmetric circuit |
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